I should know this, but I can't remember...I think all 3 OFTs at NRB have PCOSIs now, so you're seeing the current "generation" of what the OS is supposed to be. Prior to 86 series/SYSCONFIG 14, you had a joy stick and fixed function keys. You'd still have the pop-up window option for some things, but you could quickly get to a function as you started a process because the keys would change as you selected different options. It still required you to get buried deep within a sub-system though. Then came the 75-series and all of the pop-up windows (this is actually when I started learning the system) and the fixed-function keys went away (other than the ones you now see on your CDU). As a result, you now get lost in various pop-up windows as you try to get to some sub-function. Even something as simple as shutting down the computer (something you should be familiar with now) requires 5 steps to make happen.
THEN they came out with the PCOSI, which reduced you ability to tab and scroll like you could with the joy stick setup. So now you become even more dependent moving that stupid mouse around, assuming your potato isn't gummed up with horsecock sandwich grease. While it may not seem like a big deal now, trying to quickly throw a fix, or even set up a buoy FTP quickly is a much more involved process, made more annoying if you're bouncing around trying to keep your hook steady.
And don't even get me started about the mess that is the Flight Display. At least they could put boxes around the various Nav data.
